<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <style>
        *{
            margin-left: 0;margin-right: 0;
        }
        .one{
            background-color: #0456f9;
            text-align: center;

        }
        .one_ml li{
            line-height: 50px;
            display: inline-block;
            width: 100px;
            color: #bfcccc;
        }
        .one_ml li:hover{
            background-color: #678ee7;
        }
        .one_ml li:after{
            background-color:#02e7fb;
        }

    </style>
</head>
<body>
<div class="one">
    <ul class="one_ml">
        <li>手机</li>
        <li>电脑</li>
        <li>笔记本</li>
        <li>单反</li>
        <li>平板</li>
    </ul>
</div>

</body>
</html>